Malicious PDF — malware analysis report

Static analysis result for SHA-256 850188133017cdd5…

MALICIOUS

PDF

86.2 KB Created: 2021-06-29 04:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ef8b261502b99d6a537754c374bcfc8 SHA-1: d91a9dd5004d09bb92aab25f111c67775423c26e SHA-256: 850188133017cdd5aafad0899573916b2306b61e36fa099921bd7c6a69047825
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute other malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support the link farm and potential phishing or malware distribution strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2b7fb8286---fajejudujazowuxewi.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607da9b77edeb---wafafekuvogipusid.pdf
    • https://keluargamimpi2.com/contents//files/pukepisodutadogu.pdf
    • https://ferest.ro/imagini_ws/runidulizoxir.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/4ee3cdd2ab011526f25de13dc5412c2d/81068305199.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/f9bc08841d30529915a2b3558f288968/36664419963.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/2d34a5b1cbeaa0dcb19980f4efba8a15/guvibajipekuk.pdf
    • http://acecaalcoy.com/userfiles/file/56681222330.pdf
    • https://clickkedai.com/userfiles/file/82652782372.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4704cb0d6---fumexapomajufanaliguxu.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709de0cca18---rusomuvawufifavotiwixitaj.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160942efb731cb---31285148722.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d39883182---90819034830.pdf
    • http://mashtalkandil.com/userfiles/file/waxabodalo.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080107e5d021---mexalonazevorusavu.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73289ed31d---fulovejuxekobijigafiko.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/fae1da42c52c655a1ab97adb5899511d/ruzanolawapenoxoladukola.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3feb6835b1---zegilorisopu.pdf
    • https://actorconseil.com/files/file/89026250741.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9482236741---14831364386.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ab59b5bb116---narorenovalevijema.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cbbf7daa0bd---naruf.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/f9d8b259ed8761c69a68e350b98eaa84/subulamuzakike.pdf
    • http://animalscipublisher.com/files/upfiles/file/42025851092.pdf
    • http://baugeraeteverleih.de/benutzerdateien/9278534959.pdf
    • http://oilandgaswork.com/userfiles/file/golupakijukejafi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=fawn+silver+duckwing
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eac6.bin
52d4f8d4686bcffe7f7b2ec447a81c09fcbd8406c504bd362923e7cc656e5f0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC6 18540 bytes
font_01_sfnt_off00011b35.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B35 16792 bytes
font_02_sfnt_off0001334c.bin
48f47e70ac63d3ba8a393ec9794998d38814fc80c38968ede5ec7cbdc9365203		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1334C 10648 bytes

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